I was just reading about the whole boot process on computers and am curious as to why the BIOS can only read and execute code and data from only cylinder 0, track 0 and sector 1 of the disk being booted from? Why can't the BIOS read from any other disk location?
View 3 RepliesI am a beginner in ubuntu and only recently did i install Ubuntu 10.10 using Wubi. I am dual booting along with Windows 7 64bit. Before I got to know of Wubi, I created a free 20GB partition for installing linux. But since it was of no use, I decided to extend another partition adding this 20GB space. The problem now is that I am getting the following error while trying to access the partition.
"Error mounting: mount exited with exit code 12: Failed to read last sector (605949951): Invalid argument
HINTS: Either the volume is a RAID/LDM but it wasn't setup yet,
or it was not setup correctly (e.g. by not using mdadm --build ...),
or a wrong device is tried to be mounted,
or the partition table is corrupt (partition is smaller than NTFS),
or the NTFS boot sector is corrupt (NTFS size is not valid).
Failed to mount '/dev/sda5': Invalid argument
The device '/dev/sda5' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?"
These are the results after running sudo fdisk -l /dev/sda:
"Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x76c4009c
Device Boot Start End Blocks Id System
/dev/sda1 1 1 992+ 42 SFS
Partition 1 does not end on cylinder boundary.
/dev/sda2 * 1 13 102400 42 SFS
Partition 2 does not end on cylinder boundary.
/dev/sda3 13 6528 52326400 42 SFS
Partition 3 does not end on cylinder boundary.
/dev/sda4 6528 42717 290694144 42 SFS
Below is a print out of my partition Table from Fdisk, in Cylinder mode, Sector mode, and then in expert mode?
Why in expert mode does it look like Partitions 2 and 3 share the same sector / hd / Cylinders? Is this OK?
Code:
" Selected cylinder exceeds maximum supported by bios " I got this errot message when i tried to select Ubuntu ( 9.04 ) from a dual booting menu I dont know how to solve this problem
View 4 Replies View RelatedI just downloaded the Fedora 10 cd yesterday and decided to install it. I had a partition for Fedora on my system before but I'm not really sure what I did to it. It wasn't booting and it has been so long since I messed with it I just decided to reinstall with the latest (I think I was running F9 previously). So I pop in the live CD, run the install, and then reboot into Ubuntu. I modified my menu.lst to include the new vmlinuz and initrd versions, as well as the new UUID of the partition. Now when I reboot and choose Fedora from grub's menu I get this error:
Quote:
Error 18: Selected cylinder exceeds maximum supported by BIOS
I found this wiki which does a pretty good job describing the problem:
[URL]
However, I'm still unable to get this to work. According to many different sites out there this problem shouldn't exist on newer computers. Well, I just recently put a new motherboard into this box -- it's this one:
[URL]
According to their BIOS page the first release of this was late November 2008. Yes they have had 2 updates since then but it looks like those only serve to support AM3 CPUs (which I don't have) or update some audio playback issues. I seriously doubt I need to update my BIOS to get this to work.
Here's my fdisk:
Code:
$ sudo fdisk -l
Disk /dev/sda: 400.0 GB, 400088457216 bytes
255 heads, 63 sectors/track, 48641 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[code]....
I can get Slackware 12.1 to boot (though it kernel panics during startup...not sure what I did to make it angry), but grub immediately fails when I attempt to boot Fedora. Here's the entry from menu.lst:
Quote:
titleFedora 10 (on /dev/sdb1)
root(hd1,0)
kernel/boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=178bc9f9-76ba-48aa-a588-de978cc1eee1 rhgb quiet
[code]...
I have verified that the vmlinuz and initrd are both correct. I put the UUID in there after running vol_id so I'm sure the entry is solid. I have tried making it "root=/dev/sdb1" which failed with the same error, and I even tried copying the fc10 vmlinuz and initrd files over to my Ubuntu partition (which controls grub) but for some odd reason the cp command takes a really long time and then I eventually get this weird error for initrd:
Quote:
$ sudo cp /media/sdb1/boot/initrd-2.6.27.5-117.fc10.i686.img .
cp: reading `/media/sdb1/boot/initrd-2.6.27.5-117.fc10.i686.img': Input/output error
I got the same error with the dd command too. So I was going to just try and copy the files to my sdb3 partition and then modify the menu.lst entry appropriately but that doesn't seem to be plausible at this point.
I have a motherboard that was just released about 4 months ago, an Athlon X2 6000+ CPU, and 4gigs of RAM. The drives are both SATA 300 drives...it's not like this is some old Pentium Pro and the BIOS just doesn't support large drives...this is a brand new system with a very recent BIOS version.
I have successfully quadruple booted all of these in the past, but that may have been prior to the new motherboard. So that makes me think it could be something related to the motherboard but the thing is so much newer than what I previously had, certainly that can't be the problem...can it? Then I remember that Slackware boots, so if it's truly something about how the BIOS can't access some file beyond a particular section of the disk, then it doesn't make any sense that it can book slackware. Fedora is the first partition, Slackware is the last and is like 200+ GB into the disk.
Error 18 - Selected cylinder exceeds maximum supported by BIOS
I am running Jaunty Jackalope on a new machine and after a recent update I got the following message when trying to reboot:
Error 18 - Selected cylinder exceeds maximum supported by BIOS
After reading some of the info on Grub error 18 I decided to create a separate boot partition, as suggested. However, when trying to use Gparted from the live CD to create some space ahead of /sda1, Gparted would run for a while and then crash. The crash message says:
"e2fsck crashed with SIGSEGV in qsort" So now I am stuck, unable to boot from HDD and unable to create new partitions (the other partitions on the disk work fine with Gparted). Could all of this be due to corrupt /sda1 partition?
I was attempting to reformat a 16GB MicroSD card in my camera when the battery died mid-way. After that, any time I try to read the card in my camera, it gives me a "Card Error" and does not allow me to reformat it in my camera.
So, I thought I would plug the camera in to the laptop with it set to host the card as media when plugged in as USB, in an attempt to fix the formatting issue.
However, when I plug it in to my linux machine, it does not register as a device (e.g., /dev/sda) due to some errors, therefore I cannot reformat it. Essentially, I think I need to fix the partition table but I'm not sure how to when it doesn't register as a device. code...
What are the possible problem when Windows access the file from Ubuntu got Read Only even though have a full permission to read, write and execute the file? Ubuntu to Ubuntu accessing the file there is no problem only Windows got a problem.
View 1 Replies View RelatedImmediately after the grub menu disappears I get the following error msg: Error 18 Selected cylinder exceeds maximum supported by BIOS. Sometimes the grub options come up again (in Text mode) ...all works fine Sometimes just start via "Failsafe", reboot...all works fine. What is happening here and what would be the right procedure to avoid this happening again.
View 6 Replies View RelatedI can get into the BIOS just fine but cannot find anything such as NX or Exucute Disable mode( on or off) Does anyone have any ideas? I contacted Acer support and they may be able to help only if I pay for their support. AS of now I have Ubuntu 10.4 installed and upgraded to 10.10 but have black screen with message about (NX) or Execute Disable in bios. The message says---This CPU is family 6, model 37, and has NX capabilities but is unable to use these protective features because the BIOS is configured to disable the capability. Please enable this in your BIOS. I have windows 7 professional on one partition and Ubuntu on the other partition. I can still access Ubuntu 10.4. but have the black screen on 10.10
View 3 Replies View Relatedi need 2 king of permission 1 is full access and other is read+exceute. it can be by ip by userid or by group. as i am beginner try to find such example cant find it so far see below my smb.conf file
[Code]....
I was wondering what is the difference between directory execute and read permission?Also, how do I recursively remove executable permission from a dir, but just apply it to normal files?
View 6 Replies View RelatedBinary files need only execute permission to execute. No read permission is required. But all executable files must be read by the kernel into main memory before executing. Also script files need both read and execute permissions for executing the file.
View 5 Replies View RelatedI am trying to write a script (especially C-shell) to execute a fortran code that reads in parameters from keyboard typing. I will have to process this .F code for many times with the parameters the same for all my data files, therefore, I don't have to type in everytime I execute the .F code. But I don't know what is the command in c shell to read in a text files that contains all the parameters I want and can make the shell read in appropriately to feed the .F code.
View 3 Replies View RelatedCan dd read cylinder 0, head 0 of the hard disk? It seems as if he can't. When I do
Code:
dd if=/dev/sda bs=1 | hexdump -C | more
I think it begins with track 1 and not track 0.
I am using following code to read a lien from a file and store the value to a variable $line and execute it.
while read line
do
./$line &
[code]...
We have a test server in which we have not taken backup. Contents under /etc is entirely lost.
I need to execute scp to copy mysql data directory.
Also it is in remote location. Can I recover the data by scp by creating some /etc/passwd , /etc/shadow files ?
I'm trying to do an installation of Ubuntu 11.04 on my Windows 7 setup. I have another harddrive, which only has one partition. It is fresh formatted with NTFS, I launch Wubi, choose the partition, everything's fine, reboot, and when I choose Ubuntu for the first time, I get this error[URL]My Windows 7 installation is on a SSD harddrive, and my Ubuntu installation is a Western Digital WD360 SATA disk. In my BIOS I have "SATA Mode" set to "IDE".
View 9 Replies View Related2 months ago, I built a dedicated backup server using 4 2TB SATA drives for software RAID5 (6TB total). A few days ago, smartd sent out mail saying it found an unreadable sector on one of the drives. I ran selftest using smartctl and the error persisted. So far, neither software RAID nor ext4fs running on top of the RAID volume have reported errors.
MOST OPTIMISTIC: It is normal to have a few bad sectors among billions. Software RAID takes care of alternatives. Keep using the system until RAID spits a more serious warning in the future.
MOST PESSIMISTIC: It is a really bad sign to lead a disaster. No good disk drive should have bad sectors especially when it is only 2 months old. The error is simply not detected by software RAID and ext4. Replace the drive immediately and return the bad drive to the supplier.
I just tried to burn an ISO to a CD-R in K3B, and it finished with the message "written data in track 1 differs from original." I get that a lot; until now, I blamed it on my failing CD drives . What can I do to avoid it besides burning at a slow speed? I know that, having heard years ago that I should burn at 4x; but my new DVD-RW burner's slowest writing speed is 16x. (I'm annoyed at that. It was a Christmas gift, and I didn't think of specifying a write speed. I wouldn't be surprised if new CD drives can't burn at such a slow speed, though.)
View 1 Replies View RelatedI am trying to write a C++ Code to read write a XML file in C++.I researched a lot and find xerces is used for that but I am not able to write the code for that.Please provide me some links on how to run a code that R/W a xml file in C++.
View 1 Replies View RelatedI have a text file have carriage return code ^L , ^K , I can use vi to read this code , can advise if I want to see this code , what can i do
View 4 Replies View RelatedI'm trying to mount my new Western Digital Elements 2tb hard drive, but every time I try to plug it into the computer I get this error message:
Quote:
Error mounting: mount exited with exit code 12: Failed to read last sector (3907027119): Invalid argument
HINTS: Either the volume is a RAID/LDM but it wasn't setup yet, or it was not setup correctly (e.g. by not using mdadm --build ...), or a wrong device is tried to be mounted, or the partition table is corrupt (partition is smaller than NTFS),
[code].....
But when I tried opening the hard drive from nautilus I still got the same error message as above (no other volumes was connected at the time). I've also tried opening and watching it in GParted, and I can see it there as a volume that's not allocated. When I tried to allocate the hard it I got the message that it had no partition table. And that I cold make one. I tried and Ubuntu suggested to make a MS-DOS partition table for it. But there I got a little scared as I've not done this before. The external hard drive is brand new and was brought today. And I don't have the possibility to test it with Windows or Mac as I'm using Linux only on my machines.
I'm sure this is simple but I haven't a clue how to do it other than System Monitor, which only displays for the total uptime.
I want to see what my total network data use is in Bytes (GB, MB, or KB) downloaded/uploaded for the month or any given date range.
Rationale is I want to use wireless tethering from my phone to replace my broadband connection at home. At the moment my phone contract gives me unlimited data access, however if I were to sign a new contract today this would drop to 2 GB a month with hefty overage charges.
I've been trying to rip DVD's using AcidRip but whatever DVD I try I get the same error from AcidRip - Can't Read DVD track. Faulty Disc?
After reading the forums I've tried /dev/dvd ,/dev/sr0 (Found by using the Disk Utility), /Media/DVD Title etc and tried running AcidRip both as myself and Sudo without success.
I have an audio recorder that doubles as a music player. It can play WAV files. So I put in some WAV files and they are out of order, even if they are named numerically. Read somewhere about a little CLI software called fatsort so I installed. The device is located at /dev/sdc. So naturally I write fatsort /dev/sdc, it says something about permission. So sudo fatsort /dev/sdc. Thing is, it says:
Code: sort_fs: Device or resource busy! If I "eject" it (unmount) then it says something about cannot read boot sector or headers. On Windows there is FAT Sorter. It does not work in WINE. So every time I put something in, I have to get to a Windows computer to sort it. It seems like fatsort is the only program that sorts FAT systems in Ubuntu/Linux.
i need to write a c code to ping IP addresses which are read from a text file and need to log the response time in another text file.
View 4 Replies View RelatedI have a fully up-to-dateCentOS 5.6. As of some very recent package update (later than May 12), sound-juicer is unable to retrieve track data for any disc; it just reports "Unknown Title" and "Unknown Artist".
Unfortunately I do not know how to tell which particular package it was, or even how to get a list of recently-updated packages.
Tracks are still extracted fine, it's just the musicbrainz connection which is doa.
I'd be happy to try an alternative program with musicbrainz capability, but couldn't find any. The installed k3b doesn't have any ripping options in the tools menu, where I gather it's supposed to be.
how can i open the sosreport after generating it from the systemi need to know how to view the data inside it
View 1 Replies View RelatedI have an application where I am sending data via serial port from PC1 (Java App) and reading that data in PC2 (C++ App). The problem that I am facing is that my PC2 (C++ App) is not able to read complete data sent by PC1 i.e. from my PC1 I am sending 190 bytes but PC2 is able to read close to 140 bytes though I am trying to read in a loop.Below is code snippet of my C++ AppOpen the connection to serial port
Code:
serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
if (serialfd == -1)
[code]...